// session_sendmessage.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "session_sendmessage.h"
#include "SessionMessage.h"

#include <functional>
#include <psapi.h>
#pragma comment(lib, "psapi.lib")

#define MAX_LOADSTRING 100
#define WM_USER_SESSION_MESSAGE (WM_USER + 1)

class Button {
public:
	Button(LPCTSTR text, RECT rc, std::function<void()> fun) : text_(text), rect_(rc), fun_(fun) {}
	void OnClick(POINT pt) {
		if (!::PtInRect(&rect_, pt))
			return;
		if (fun_)
			fun_();
	}
	void OnRender(HDC hDC) {
		::SetBkMode(hDC, TRANSPARENT);
		::FillRect(hDC, &rect_, (HBRUSH)::GetStockObject(GRAY_BRUSH));
		::DrawText(hDC, text_, text_.GetLength(), &rect_, DT_CENTER | DT_VCENTER);
	}
protected:
	ATL::CString text_;
	RECT rect_;
	std::function<void()> fun_;
};

HWND hParent_ = 0;
void session_message(bool bPost) {
	TCHAR szProcessName[100];
	GetModuleBaseName(GetCurrentProcess(), NULL, szProcessName, 100);
	DWORD pid = 0;
	GetPidByProcessName(szProcessName, &pid);
	ATL::CString msg;
	msg.Format(_T("%s to PID %d")
		, bPost ? _T("POST") : _T("SEND")
		, (int)pid);
	MessageBox(hParent_, msg, _T("Session message"), MB_OK);

	bPost
		? SessionPostMessage(pid, WM_USER_SESSION_MESSAGE, pid, bPost)
		: SessionSendMessage(pid, WM_USER_SESSION_MESSAGE, pid, bPost);
}

Button *btnSend_, *btnPost_;


// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{

		RECT rc;
		rc.left = 10; rc.right = 210;
		rc.top = 10; rc.bottom = 110;
		Button btnSend(_T("Send Session Message"), rc, []() {
			session_message(false);
		});
		btnSend_ = &btnSend;

		::OffsetRect(&rc, 0, 150);
		Button btnPost(_T("Post Session Message"), rc, []() {
			session_message(true);
		});
		btnPost_ = &btnPost;

    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    // TODO: Place code here.

    // Initialize global strings
    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadStringW(hInstance, IDC_SESSION_SENDMESSAGE, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_SESSION_SENDMESSAGE));

    MSG msg;

    // Main message loop:
    while (GetMessage(&msg, nullptr, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEXW wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_SESSION_SENDMESSAGE));
    wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCEW(IDC_SESSION_SENDMESSAGE);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassExW(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   hInst = hInstance; // Store instance handle in our global variable

   HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

   if (!hWnd)
   {
      return FALSE;
   }

	 hParent_ = hWnd;

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_COMMAND:
        {
            int wmId = LOWORD(wParam);
            // Parse the menu selections:
            switch (wmId)
            {
            case IDM_ABOUT:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
                break;
            case IDM_EXIT:
                DestroyWindow(hWnd);
                break;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
        }
        break;
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
            // TODO: Add any drawing code that uses hdc here...
						if (btnPost_)
							btnPost_->OnRender(hdc);
						if (btnSend_)
							btnSend_->OnRender(hdc);
            EndPaint(hWnd, &ps);
        }
        break;
		case WM_LBUTTONDOWN: {
			POINT pt;
			pt.x = GET_X_LPARAM(lParam);
			pt.y = GET_Y_LPARAM(lParam);
			if (btnPost_)
				btnPost_->OnClick(pt);
			if (btnSend_)
				btnSend_->OnClick(pt);
		} break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
		case WM_USER_SESSION_MESSAGE: {
			ATL::CString msg;
			msg.Format(_T("You received a session message, PID is %d, TYPE is %s")
				, (int)wParam, lParam == 1 ? _T("POST") : _T("SEND"));
			MessageBox(hWnd, msg, _T("Session Message"), MB_OK);
		} break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}
